532 on 2,38 mm custom DIY scalpel pricking iron (close to Dixon 11 SPI). Well hammered. 
Here the very good comparison  
http://blog.naver.com/PostList.nhn?from=postList&blogId=not_exist&categoryNo=0¤tPage=9 
http://blog.naver.com/PostList.nhn?from=postList&blogId=not_exist&categoryNo=0¤tPage=8